Trepanning machining is used to produce the following features and parts:
- Low volume disks from flat stock. Disks can be fabricated up to .25 (6.35mm) thick and 6 (152mm) in diameter.
- Large diameter through holes in flat stock. Trepanning is limited to creating holes that are not greater than five times the material thickness.
- Machining internal and external circular grooves or o-ring glands.
- Deep holes 2 (50.8mm) or more in diameter. This process is similar to gun drilling where the cutter is centering at start, and forced lubrication and cooling is used. Straightness and diametric tolerances are almost comparable to gun drilled holes.